Update Readme.md - known issues

Author: JohannesHoppe

README.md

@@ -133,6 +133,11 @@ angular-cli-ghpages --repo=https://[email protected]/organisation/your-repo.gi
 > You have to treat the GH_TOKEN as secure as a password!
 
 
+# Known issues
+
+The old `github-pages:deploy` command created a `404.html` in the `dist` folder.
+This was required to fully support the router [`PathLocationStrategy`](https://angular.io/docs/ts/latest/api/common/index/PathLocationStrategy-class.html). Right now you have to copy `index.html` to `404.html` on your own. Please submit an [issue](https://github.com/angular-buch/angular-cli-ghpages/issues) if you want this feature back.
+
 
 ## License
 Code released under the [MIT license](https://opensource.org/licenses/MIT).